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#1
12-04-2016, 10:39 AM
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Who on here is a 2004R transmission guru ? (need help)
I'm on the last stages of getting my GTO road worthy. (just in time for winter) jeesh.
Most everything is good to go except a noise I discussed on here several weeks ago. For those of you who try to help me let me eliminate some noise producing possibilities. Not an engine noise. Nothing is rubbing or touching. Not exhaust. Not the torque converter. Only makes the noise in neutral. Here's what I DO have. . . . .2004R rebuilt. Has a constant pressure valve. Checked the pressure at the tranny and at idle it's 195 psi. The sound emanates from the same coolant line going to the radiator. A whooshing non metallic hydraulic sound. Can even feel it when holding the line. Comes and goes at idle. Here's the question. Is the pump capable of making that sound that would find it's way thru that coolant line? How difficult is it to replace that pump by dropping the pan ? Also . . .tranny shifts perfect. Only annoying sound is at idle. If I pay a transmission shop to replace the suspect pump they need $1000 + because at that point they own the transmission (so to speak) they would have to go thru the whole thing to stand behind it. Transmission fluid is clean, pan was spotless. Thanks in advance. Bob |
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#2
12-04-2016, 11:28 AM
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Pump sits behind the torque converter... you need to remove the transmission to replace it. Let us know what you end up finding.... I'm getting ready to put one in mine too. Honestly if you are pulling the trans yourself i'm sure you could handle changing the pump yourself, nothing difficult about it. When you pull the torque convert out, you are looking at the front of the pump. You should upgrade the pump at this point too, they are supposedly a weak point in that transmission. You need to go up to a 10 vane vs 7 vane impeller. 10 vane gets you more consistent line pressure. That may actually be what you are hearing. Weak pump possibly.
Last edited by Cardo; 12-04-2016 at 11:34 AM. Reason: added to... |
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#3
12-05-2016, 07:15 AM
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Idk maybe a boost valve problem?
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"The democracy will cease to exist when you take away from those who are willing to work and give to those who would not." Thomas Jefferson 
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#4
12-05-2016, 07:39 AM
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Before going thru an expensive transmission removal and possibly an overhaul I would remove the PR valve and see if the second land has two "flats" on it. This was done on some 700-R4 and 200-4R models from the factory, and recommended in some shift improver kits available for those transmissions.
The factory may have done this to help with "buzz" like you are having. It is supposed to help with oil flow to the converter as well......Cliff
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If you can read this, thank a teacher. If you can read this in English, thank a Veteran! https://cliffshighperformance.com/ 73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile), |
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#5
12-05-2016, 02:58 PM
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Also, a few of the top 200-4R builders claim the constant pressure setup is hard on the pumps. So you may be on the right track.
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 ___________________________________ "Objects in mirror are closer than they appear" 
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#6
12-11-2016, 01:32 AM
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I'd talk tof vince at Janis Transmission in Akron ohio.
He's the man when it comes to 200-4R transmissions He has done several for me
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Chris Collier 1969 firebird, pro touring build. Full Global West suspension 474 Stroker with Molnar Crank and Rods, DCI Ram Air 5 Top end, Holley fuel injection, Vince Janis 200-4R trans "There is no such thing as too much horsepower" |
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#7
12-12-2016, 10:54 AM
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Was in Alabama last week. Spoke to the guy who rebuilds 200's and 750's all day (plus a multitude of other racing -hot rod transmissions). Explained the noise I have. His response was . . . . .that constant pressure valve creates 200 to 250 lbs of pressure at idle, depending on fluid temp. It's going to make that sound.
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